@article{MM2_1973__11_154214,
     author = {Paul H. Rabinowitz},
     title = {A {Note} on {Pairs} of {Solutions} of a {Nonlinear} {Sturm-Liouville} {Problem.}},
     journal = {Manuscripta mathematica},
     pages = {273--282},
     publisher = {mathdoc},
     volume = {11},
     year = {1973},
     zbl = {0276.34019},
     url = {http://geodesic.mathdoc.fr/item/MM2_1973__11_154214/}
}